Apparatus for casting pipe.



PATENTED FEB. 25, 1908.

D. B. DIMIGK. APPARATUS FOR CASTING PIPE,

APPLICATION FILED APE. 25.1907.

3 SHEETS-SHEET l.

No. 880,284- PATEN-IED FEB. 25, 1908.

-D. B. D-IMICK.

APPARATUS FOR CASTING PIPE. "APPLIOATIOK FILED APB. 25.1907."

3 sums-sum 2.

(June/M305 1n: NORRIS PETERS ca., WASHINGTON, n. c

No. 880,284. PATEN'I'ED FEB. 25, 1908.

v D. B. DIMIGK.

APPARATUS FOR CASTING PIPE.

APPLIGATION FILED APR. 25,1907,

3 SHEETS-SHEET 3.

flf/J 61110 244 1 5 wilmeooeo ms RCRRIS PETERS :04, wnsmuarau, B. E:

DANIEL B. DIMIOK, OF BIRMINGHAM, ALABAMA.

APPARATUS FOR CASTING PIPE.

Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed April 25. 1907. Serial No. 370.285.

To all whom it may concern:

Be it known that I, DANIEL B. DIMIOK, a citizen of the United States,residing at Birmingham, in the county of J eflerson and State ofAlabama, have invented certain new and useful Improvements in Apparatusfor Casting Pipe; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to improvements in an apparatus for casting pipeand, as distinguished from the apparatus now in vogue in which the pipeis cast on end with the bell up and in a dry mold, it consists in themech anism disclosed and wherein green sand may be used instead of drysand, if desired, and wherein the pipe is molded bell down.

While I do not limit myself to the exact details shown and described,for the purposes of disclosure reference is had to the accompanyingdrawings, illustrating a preferred embodiment of the invention, in whichlike letters designate the same parts in the several views, and in whichFigure 1 is a view in elevation of the assembled apparatus, with thepattern in position before withdrawal. Fig. 2 is a longitudinal sectionthrough the mold on the line of joinder of the segmental cope indicatedat 2 2, Fig. 3 but omitting the vertical sprue rods shown in Fig. 6.Fig. 3 is a plan view. Fig. 4 is a bottom view. Fig. 5 is a fragmentarydetail view, showing the manner of applying the centering ring and alsoshowing a slightly modified form of sectional bell pattern, and Fig. 6is a longitudinal sectional view through the mold members in theirpositions preparatory to casting, and showing a slightly modified formof the apparatus, a portion of the hinged cope being shown in elevation.

end within the annulus d, as'clearly shown in Fig. 2.

j designates the bell portion of the pattern and is of segmentalconstruction, being preferably formed of three sections. Ofcourse thisbell portion of the pattern may be formed for difierent designed bells,but for the purpose of illustrating a method of forming bells withgrooves therein to make a cement joint, the bell portion of the patternillustrated in Fig. 2 is provided with an inner face plate lc havingannular grooves therearound.

Z designates the pattern for the length of the pipe and consists of theusual cylindrica member provided with a beveled tongue at its lower endadapted to seat within the beveled recess in the upper end of the bellportion of the pattern to form a snug joint, as at m. V

n designates a stripping plate in the form of an annular ring providedwith inwardly disposed rooved lugs 0 adapted to aline with the u s f andg when the, stripping plate n is placed in position on top of the flaskiso that tie bolts p passing throu h the flask and base board will passthroug said slotted lugs and securely hold the several parts locked inposition. The external circumference of this stripping plate n is suchas to be just contained within the pipe pattern Z.

q designates a cope which is formed in two sections, being provided witha top flange r and vertical flanges s, the vertical flanges 8 beingadapted to be secured together in any suitable way. In the drawings(Figs. 2 and 3) this is illustrated by bolt holes and bolts.

On the sides adjacent the vertical flanges, the cope is provided withthe curved por tions t which together form the swells n (Fig. 3). Thesegmental portions of the cope are also provided with brackets which maybe cast thereon, comprising the vertical supports 4) and the transversewebs w, which webs are enlarged centrally over the vertical portions 1)and are apertured to receive the vertical rods-.00 supported in taperedsockets formed in the enlarged portions y on the base board of the drag.The horizontal flange r I the pipe.

.of the cope is also provided with central enlarged ortions z aperturedto receive the upper end of the vertical guiding rods :20.

1 designates a second stripping plate which consists of an annular ring,the mner circumference of which is of such a diameter as to ust containthe pipe pattern Z, and this annular strippin plate 1 is provided with adepending annu ar portion 2 to afford a deeper guiding surface for thepipe pattern I when being withdrawn, and particularly to form the moldcavity for the spigot ring of This stripping plate 1 is also providedwith a plurality of fingers 3 projecting from its external circumferenceand adapted to rest on the top flange 1' of the cope and to be securedthereto in any suitable manner.

In the drawings for the purpose of illustration, the method of securingthese fingers tpl the cope flange r is by means of U-shaped c s 4.

n the construction previously illustrated, is set forth the broadconception of the invention, which, however, may be improved as tomatters of details in many ways. For instance in Fig. 5, as a means forcentering the bell portion of the pattern there is illustrated acentering ring comprising the annular member 5 recessed internally toform the upper and lower bearing faces 6 and 7, the

'base of the centering ring being in the form of a spider having theprojecting ends 8 provided with apertures 9 therein, which apertures arearranged to aline with the two tapering sockets formed in the enlargedportions'y of the drag, the spider or centering ring being firmlysecured in position on said drag through the medium of two headed pins10 passin through the apertures 8 of the spider an the apertures in theenlarged portion y of the drag. By this arrangement the segmental bellportion of the pattern can be centered and held securely in itsassembled position. In Fig. 5 there is also shown a slight modificationin the form of the bell portion of the pattern comprising an annularconcave recess, whereby the bell portion of the central core of the moldwill be of convex shape, the pipe when cast containing a concave annularrecess instead of a plurality of annular grooves as before described,this reas at 15 to receive the conical flask member 16 in such mannerthat the flask member may be readily detached from the supporting.

instead of being secured by bolts or in other Ways, the sections of thesame are illustrated as being hinged together as at 23 and securedtogether at the other edge when in their as sembled position by suitableclips 24. In this construction as in that previously de scribed guiderods are employed corresponding to the guide rods 00 and indicated onthis view at 25.

Having thus described the construction of the various parts of theapparatus and referring particularly to Figs. 1 to 4, in assembling theparts preparatory to forming the finished mold, the flask i is placed inposition upon the turret or central projection c with its lower endresting within the annulus d. The hollow drag a is then filled with sandand after thorough ramming the sand is cleaned off flush with the top ofthe drag, as illustrated by the dotted line at 5 in Fig. 2. Upon thissmooth surface the bell portion of the pattern is assembled, beingcentered in any suitable manner, as for instance by a centering ring aspreviously described with reference to Fig. 5, which centering ring willalso keep the segments from being rammed out of place. The bell portionof the pattern is then filled with sand, and after thorough ramming thesand is again smoothed off at a level with the turret and the top of thebell portion of the pattern. The barrel portion of the pattern is thenplaced in position and sand is then poured in the annular space betweenthe flask i, and the barrel portion of the pattern Z and thoroughlyrammed up to the top of the flask. The centering ring 5 (Fig. 5) may nowbe removed. A layer of parting sand is now placed on that portion of therammed sand exterior of the bell portion of the pattern and the verticalguide rods at having been placed in position in the sockets formed at gon each side of the drag, the cope is lowered into position, the guiderod passing through the apertured enlarged portions formed on the cope,as before described. The space between the outside of the pattern andthe cope is then filled with sand and thoroughly rammed up to the top ofthe cope. During this latter operation, sprue rods are supported withinthe swelled portions u of the cope as hereinafter more fully describedwith reference to Fig. 6 so that the rods may be withdrawn, formingvertical sprue gates for receiving the molten metal when casting.

The ramming having been completed and the cope secured in place, thestripping plate n is now placed in position, as shown in Fig. 2, andsecurely bolted in place by the rods p. Similarly, the outer strippingplate 1 is placed in position and securely affixed to the cope by theclips 4, as heretofore described.

The barrel portion Z of the pattern is then drawn out by means of anysuitable power, the stripping plates n and 1 serving to guide thepattern to make a perfect draw. The whole cope is then lifted off, theguiding rods :1: serving to keep it free from the walls of the insidecore. The bell portion of the pattern being now exposed and beingsegmental in construction, the sections are removed laterally, thegrooves in the face plate is preventing vertical movement of the bellpattern. Horizontal gates are then cut in the sand to aline withthe moldchamber and the vertical gates heretofore referred to when the outercore is again placed in position. The vertical sprue gate and thehorizontal sprue gate, are hereinafter designated at 27 and 28,respectively, with respect to Fig. 6. The core and outer section of themold having been properly coated in any well known way and suitablydried with hot air, the cope and the outer mold member are lowered intoplace over the central core, being still guided by the vertical guiderods 00, when a suitable chill plate is lowered over the top of themold.The parts having thus been assembled, the molten metal is poured fromthe top into the mold, by means of the vertical stantially similar.

ner of mounting the conical flask 16.

sprue gate, see Fig. 6, formed on the side within the swelled portion ofthe cope, the metal flowing upwardly until it strikes the chill plate.

Referring to Fig. 6, the operation is sub- T he pattern having beenwithdrawn, the mold members having been prepared and the outer moldmember re placed in position, the tapered sprue rod 26 may now bewithdrawn if this has not already been done, leaving the longitudinalvertical sprue gate 27 communicating with the horizontal gate 28 whichin this view is out in the base sand instead of in the outer coremember. In this view also a core 29 is shown located at the base of thehorizontal gate 28 and on this core the metal falls in passing into themold cavity 30. This will prevent the cutting away of the base sand bythe falling metal, and the feature may or may not be employed, asdesired.

An important feature of the construction shown in Fig. 6' is theconstruction and man By the arrangement shown, it will be obvious thatthe tie bolts 19 being released, the tapered flask may readily be pulledout as soon as the pipe is cast and this allows the walls of the mold togive way as the casting contracts in cooling, thus preventing the pipefrom developing a crack caused by internal stress.

In practice there is some difliculty, in the ordinary construction ofmolds, in easily extracting the casting owing to the fact that the moldbecomes very hard in drying out, so that it is necessary that thecasting be Worked out of the mold with considerable difficulty. Anotheradvantageous feature of'Fig. 6 therefore resides in providing a hingedconnection between the sectional cope members, and these hinges allowthe cope to open through an angle of about 90 degrees.

The operation of removing the cope and preparing the mold members is thesame as that previously described, the guide rods 25 being employed toguide the cope in being removed from and replaced around the coremember, but of course after the members have been set ready for castingand it is desired to open up the cope, it is necessary that at least oneof the rods be removed in order to enable one of the cope sections toswing on its hinges.

It will also be understood that the combined drag, bottom board andturret are integral and remain permanently in position, that is to saythey are not rolled over, the sand being simply struck off and slickedup at the level of the top of the drag from day to -day, avoiding thenecessity of ramming the base sand after each operation.

As stated in the object of the invention, I may use in this apparatuseither dry sand molds or green sand molds. As is well known to thoseskilled in the art, it has heretofore been impossible to successfullycast pipe sections in green sand molds. I am enabled to accomplish thismost desirable re sult, by the simple expedient of first drawing out mypattern between the stripping plates shown, and then lifting off thecope. This entirely obviates the necessity of dry sand" cores, togetherwith the great delay andexpense involved in drying or baking the same.Furthermore, the use of green sand instead of dry sand, allows the corebarrel to be removed quite easily, if it is done immediately aftercasting, and as soon as the iron has set in the mold. As is well knownto those skilled in the practice of this art, it is very diflicultindeed, and often impossible to get a core barrel out, quickly andexpeditiously, when dry sand is used. Dry sand, therefore, consumestime, and restricts the output, whereas by the use of green sand, I haveexperienced no difficulty, and have actually produced in practice agreater output than I anticipated. Therefore, I regard the structure bywhich I am enabled to use green sand, and also that by which I amenabled to withdraw my casting practically as soon as it sets, asimportant features of my invention.

I do not of course wish to be understood as limiting my invention to theprecise details of construction and operation as above set forth, sinceit is obvious that the same may be considerably varied without departingfrom the spirit of my invention.

Having thus described the invention what I claim is 1. In apparatus forpreparing a mold for casting hollow articles, the combination of meansfor forming the core member and an outer mold member around a sectionalpattern, with a stripping plate, to aid in withdrawing the pattern, andmeans for securing the same on top of said core within the said pattern,substantially as described.

2. In apparatus for preparing a mold for casting hollow articles, thecombination with a base support,'of means for forming a core and anouter mold member said means comprising a sectional pattern, a strippingplate, to aid in withdrawing said pattern, and other means for securingsaid stripping plate on said core within said pattern, said other meanscomprising tie rods passing through said core and securing saidstripping plate to said base support, substantially as described.

3. In apparatus for preparing a mold for casting hollow articles, thecombination of means for forming a core and outer mold member said meanscomprising a sectional pattern, an annular stripping ring, to aid inwithdrawing said pattern, and other means for securing said strippingring on top of said mold member in substantial engagement with theexterior of the said pattern, substantially as described.

4. In apparatus for preparing a mold for casting pipe, the combinationof means for forming a core and outer mold member said means comprisinga sectional pattern, having a barrel portion, a stripping ring to aid inwithdrawing said pattern provided adj acent its inner circumference witha depending annular portion, and means for securing said stripping ringon the top ofsaid outer mold member with said annular depending portionin substantial engagement with the exterior of the barrel portion ofsaid pattern to form the spigot of the mold, substantially as described.

5. In apparatus for reparing a mold for casting pipe, the com inationwith means for forming a core and outer mold member comprising anelement a sectional pattern, having a barrel portion, a cope, astripping plate and means for securing the same on said core within thebarrel portion of said pattern, an external stripping ring surroundingthe outer barrel portion of said pattern, and means for securing thesame to said cope on top of said outer mold member, substantially asdescribed. I Y

6. In apparatus for preparing a mold for casting pipe, the combinationwith a base support, a flask carried thereby, a sectional pattern, aninternal stripping plate and means for securing the same on said flask,and an external stripping plate, and means for securing the same on saidcope, substantially as described.

7. In apparatus for preparing a mold for casting pipe, the combinationwith a drag carrying a turret member centrally thereof, a flask mountedadjacent said turret member, a stripping plate mounted on said flask, asectional pattern, and a stripping plate mounted around said sectionalpattern at the upper end thereof, substantially as described.

,8. In an apparatus for preparing a mold for casting pipe, thecombination of a drag,

.a turret member carriedthereby, and a means detachably securing saidflask and turret member together, comprising a tongue and grooveconnection therewith, and a pattern surrounding said flask member,substantially as described.

11. In an apparatus for preparin a mold for casting pipe, thecombination 0 a drag, a turret member formed integral therewith andcomprising a cylindrical projection rovided with internally disposedslotted ugs at the upper end thereof, a tapering flask member mounted onsaid turret member, and means for detachably securing the same together,a centrally apertured stripping plate mounted on said flask member andprovided with internally disposed projecting slotted lugs, alining withsaid first mentioned slotted lugs, tie rods connecting said opposedslotted lugs together, a pattern surrounding said flask and strippingplate, a

cope, a stripping ring surrounding said pattern and provided with anannular depending portion, and means for securing said stripping ring tosaid cope with said annular depending portion in engagement with theexterior of said pattern, substantially as described.

12. In an apparatus for preparing a mold tern, substantially asdescribed.

13. In an apparatus for preparing a mold for casting pipe, thecombination with a drag, provided with a pair of apertures, asectionalbell pattern provided with an irregular interior face, means for holdingsaid sectional pattern in position, comprising a centering ringapertured to aline with the apertures, in

said drag and headed pins passing through said apertures, substantiallyas described.

14. In an apparatus for preparing a mold for casting pipe, thecombination with a drag,

provided with a pair of apertures, a sectional bell pattern providedwith an irregular interior face, means for holding said sectionalpattern in position, comprising a centering ring apertured to aline withthe apertures in said drag and headed pins passing through saidapertures, and an upper pattern section surmounting said bell pattern,substantially as described.

15. In an apparatus for preparinga mold for casting pipe, thecombination of a drag provided with a turret member formed integraltherewith, a tapering flask member superposed on said turret member, asectional pattern, and a cope member supported on said drag andcomprising a pair of hinged sections, substantially as described.

16. In an apparatus for preparing a mold for casting pipe, thecombination of a drag provided with a turret member formed integraltherewith, a tapering flask member superposed on said turret member, asectional pattern, and a sectional cope member supported on said dragcomprising a pair of hinged sections and means for centering saidsectional pattern, substantially as described.

17. In apparatus for preparinga mold for casting pipe, the combinationwith a hollow drag, a central flask therefor, a sectional bell pattern,a barrel pattern, a cope having swelled portions and provided onopposite sides with guiding means and also provided with an external topflange, guiding rods carried by said drag engaging said guiding means, astripping plate centrally apertured and provided with inwardly extendinglugs, means for securing said stripping plate on top of said flaskwithin the barrel portion of the pattern, comprising tie rods connectingsaid lugs with said hollow drag, an external stripping plate comprisinga ring having an annular downward projection and laterally disposedfingers, and fastening means engaging the top flange of said cope andsaid fingers, substantially as described.

18. In an apparatus for making molds for casting pipe in green sandmolds, the combination of a suitable cope, a flask, a pattern providedwith a barrel portion and stripping plates on each side of the barrelportion of said pattern, substantially as described.

19. In an apparatus for making molds for casting pipe the combination ofa cope provided with apertured enlarged portions and made in sectionsprovided with swells at their meeting edges, said sections hingedtogether and adapted to be lifted vertically, with the long guide rods7c, fitting in said apertured portions and serving to guide the copewhen ifted, substantially as described.

In testimony whereof, I affix my signature, in presence of twowitnesses.

DANIEL B. DIMIOK. WVitnesses N. H. MOORE, E. S. MOORE.

